Defensive publication

ABSTRACT

AN INTEGRAL RADIOGRAPHIC ELEMENT CONTAINING A SUPPORT, A SILVER BROMOIODIDE EMULSION LAYER IN WHICH SAID IODIDE COMPRISES UP TO ABOUT 10 MOLE PERCENT OF THE HALIDE, AN X-RAY INTENSIFYING SCREEN AND AN ARRRANGEMENT OF DISTINCT LAYERS WHEREIN SAID X-RAY INTENSIFYING SCREEN AND A CONVERSION MATERIAL IS DISCLOSED. THE X-RAY INTENSIFYING THE EMULSION LAYER IS DISCLOSED. THE X-RAY INTENSIFYING SCREEN EMITS RADIATION IN THE ELECTROMAGNETIC SPECTRUM UPON EXPOSURE TO X-RAYS, WHICH EMITTED RADIATION THE CONVERSION MATERIAL IS CAPABLE OF CONVERTING TO RADIATION OF LONGER WAVE LENGTHS IN THE RANGE OF ABOUT 400 TO ABOUT 560 M$ WITH A RESULTING IMPROVEMENT IN CONTRAST. MATERIALS WHICH CONVERTS THE NORMAL RADIATION EMISSION OF BARIUM LEAD SULFATE IN THE X-RAY INTENSIFYING SCREEN TO RADIATION OF LONGER WAVE LENGTHS CAN INCLUDE ORGANIC OR INORGANIC SUBSTANCES OR MIXTURES THEREOF, SUCH AS, FOR EXAMPLE, A COMBINATION OF TERPHENYL AND 1,4-BIS(I-(5-PHENYLOXAZOLYL))-BENZENE, A COMBINATION OF 1,1,4,4-TETRAPHENYL BUTADIENE AND 1,4-BIS(2-(5-PHENYLOXAZOLYL))-BENENE, OR ZINC SULFIDE. RADIOGRAPHIC ELEMENTS IMPROVED AS DESCRIBED CAN BE CHEMICALLY SENSITIZED, E.G., WITH NOBLE METAL SENTISIZERS ALONE OR IN COMBINATION WITH SULFUR OR SELENIUM SENSITIZERS. THEY CAN CONTAIN ANTIFOGGANTS, HARDENERS, PLASTICIZERS, DEVELOPMENT MODIFIERS, COATING AIDS AND OTHER SUITABLE PHOTOGRAPHIC ADDENDA, SUCH AS DESCRIBED IN U.S. PAT. 3,297,44L (COLUMNS 4-9).

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.16, 1969, 869 0.G. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber of pages of specification, including claims and sheets ofdrawings contained in the application as originally filed. The files ofthese applications are available to the public for inspection andreproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Oflice makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED JANUARY 26, 1971 T882 014 INTEGRAL SCREEN RAEIOGRAPHIC ELEMENTWilliam Wendell Rees and Richard Karl Kurz, both Eastman Kodak C0,,Kodak Park Division, Rochester, N.Y. 14650 Filed Oct. 21, 1969, Ser. No.868,223 Int. Cl. G030 1/92 U.S. Cl. 96--82 No Drawing. 7 PagesSpecification An integral radiographic element containing a support, asilver bromoiodide emulsion layer in which said iodide comprises up toabout 10 mole percent of the halide, an X-ray intensifying screen and anarrangement of distinct layers wherein said X-ray intensifying screenand a conversion material are disposed between the support and theemulsion layer is disclosed. The X-ray intensifying screen emitsradiation in the electromagnetic spectrum upon exposure to X-rays, whichemitted radiation the conversion material is capable of converting toradiation of longer Wave lengths in the range of about 400 to about 560m with a resulting improvement in contrast.

Materials which convert the normal radiation emission of barium leadsulfate in the X-ray intensifying screen to radiation of longer wavelengths can include organic or inorganic substances or mixtures thereof,such as, for example, a combination of terphenyl andl,4-bis[2-(5-phenyloxazolyl)]-benzene, a combination of1,1,4,4-tetraphenyl butadiene and 1,4-bis[2-(5-phenyloxazolyl)]-benzene,or zinc sulfide.

Radiographic elements improved as described can be chemicallysensitized, e.g., with noble metal sensitizers alone or in combinationwith sulfur or selenium sensitizers. They can contain antifoggants,hardeners, plasticizers, development modifiers, coating aids and othersuitable photographic addenda, such as described in US. Pat. 3,297,446(columns 4-9).

